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(1) MnO(4)^(-)(aq)+8H^(+)(aq)+5e rarr Mn...

(1) `MnO_(4)^(-)(aq)+8H^(+)(aq)+5e rarr Mn^(2+)(aq)+4H_(2)O(l), E^(@)=+1.51V`
(2) `Cr_(2)O_7)^(2-)(aq)+14H^(+)+6e rarr 2Cr^(3+)(aq)+7H_(2)O(l), E^(@)=+1.38V`
(3) `Cl_(2)(g)+2e rarr 2Cl^(-)(aq), E^(@)=+1.40V`
`KMnO_(4) and K_(2)Cr_(2)O_(7)` both are well known oxidising agent and used in quantitative analysis. If a solution of a reducing agent contains HCl, which one between these two should not be used as an oxidising agent?

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The reduction potential of the half- cell reaction (1) is larger than that of the half - cell reaction (2) indicating `Cl^(-)` ion will be oxidised by `KMnO_(4).` Hence, `KMnO_(4)` solution should not be used.
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